замените слова в скобках на he.she.it.they
He is Jim.She is Jill. (Jim) has got a dog. (The dog ) is black. (Jill) has got a cat. (The cat) is grey. (The dog and the cat) can jump.

He is Jim.She is Jill. He has got a dog. It is black. She has got a cat. It is grey. They can jump.